NAME

       mBgExec - Run mBackground on all the images in a metadata table

SYNOPSIS

       mBgExec [-p projdir] [-s statusfile] [-d] [-n(o-areas)] images.tbl corrections.tbl corrdir

DESCRIPTION

       Runs mBackground on all the images in a metadata table, using the corrections generated by mFitExec.

OPTIONS

       -p projdir
              Specifies the path to the directory containing the projected images.

       -s statusfile
              Writes output message to statusfile instead of to stdout

       -d     Turns on debugging

       -n     Indicates that no area images are present (assumes equal weighting for each pixel)

ARGUMENTS

       images.tbl
              Image metadata table generated by mImgtbl.

       corrections.tbl
              Table of corrections generated by mFitExec

       corrdir
              Directory where output images should be written

RESULT

       Output FITS images will be created in the directory specified by corrdir, with names that are the same as
       the uncorrected images.

MESSAGES

       OK     [struct stat="OK", count=num-images, nocorrection=num-skipped, failed=num-failed]

       ERROR  MPI initialization failed

       ERROR  Cannot open status file: statusfile

       ERROR  Cannot access corrdir

       ERROR  corrdir is not a directory

       ERROR  Invalid image metadata file: images.tbl

       ERROR  Need columns: cntr and fname in image list

       ERROR  Too many entries in image list for compiled program

       ERROR  mBackground error

EXAMPLES

       In this example, images.tbl describes the unprojected or projected images  (filenames  are  the  same  if
       mProjExec  was  used),  and  corrections.tbl  was  generated  using  mBgModel after running mDiffExec and
       mFitExec on those images.

       $ mBgExec -p proj images.tbl corrections.tbl corr
              [struct stat="OK", count=16, failed=0]

       corr now contains the images with background removal applied.

BUGS

       The drizzle algorithm has been implemented but has not been tested in this release.

       If a header template contains carriage returns (i.e., created/modified on a Windows machine), the cfitsio
       library  will  be  unable  to read it properly, resulting in the error: [struct stat="ERROR", status=207,
       msg="illegal character in keyword"]

       It is best for the background correction  algorithms  if  the  area  described  in  the  header  template
       completely encloses all of the input images in their entirety. If parts of input images are "chopped off"
       by the header template, the background correction will be affected. We  recommend  you  use  an  expanded
       header  for  the  reprojection  and background modeling steps, returning to the originally desired header
       size for the final coaddition. The default background matching  assumes  that  there  are  no  non-linear
       background  variations  in  the individual images (and therefore in the overlap differences). If there is
       any uncertainty in this regard, it is safer to turn on the "level only"  background  matching  (the  "-l"
       flag in mBgModel.

COPYRIGHT

       2001-2015 California Institute of Technology, Pasadena, California

       If  your  research uses Montage, please include the following acknowledgement: "This research made use of
       Montage. It is funded by the  National  Science  Foundation  under  Grant  Number  ACI-1440620,  and  was
       previously funded by the National Aeronautics and Space Administration's Earth Science Technology Office,
       Computation Technologies Project, under Cooperative  Agreement  Number  NCC5-626  between  NASA  and  the
       California Institute of Technology."

       The  Montage  distribution includes an adaptation of the MOPEX algorithm developed at the Spitzer Science
       Center.